Apparatus and method of manufacturing sheet glass



L. DELLOYE 1,867,940

APPARATUS AND METHOD OF MANUFAQTURING SHEET GLASS July 19. 1932.

Filed Dec.

Patented July 19, 1932 UNITED STATES PA ENT OFFICE LUCIE] DELIDYE,

I'ACTUBB DE GLACES cmzr, OII PARIS, FRANCE nrm'rus arm amnion or muracrunme srmnr crass Application fled December 18, 1928, Serial' 1T0. 825,806, and in France December 18, 1927'.

In intermittent machines for forming glass sheets now in common use molten glass is generally poured from a pot onto an inclined receiver, having side walls, on which it slides to a formin pass located between rollers plllaced opposite the lower ends of the receiver. using such machines thev lass in its movement on the receiver is fe to and through the center of the pass before it feeds through ,otheends th'e'reof, thus producing a rounded front or leading'end on the sheet. In a similar manner, when the sup 1y ofglass on the receiver is being exhauste the feedthrough the ends of the pass ceases before the feed L5 through the center thereof, producin a rounded end onthe rear or trailing en of the sheet. These rounded ends must be rejected in cutting the glass to size,,with resultant waste. l The object of this invention is to prevent these rounded ends and this I accomplish by the use of certain features and by the method hereinafter described.

I rovide a removable dam, referably in N the arm of a shutter, across e lower end of the receiver immediately in advance of the formin pass, which dam is retained in place un the glass contacts therewith through to dam may be raised to permit the glass to flow uniformly to the pass throughout the width thereof to the scope of fogming a flat front of'the-sheet. The lower edge of the dam may be shaped in such a manner as to check the passage of the glass or to permit it to pass at the sides of the receiver where the glass is colder and therefore .more slugh than in the center of the receiver. The aim or shutter may have a flat glass holding surface, or if it is found desirable, may have such surface convex, in order that the glass fed to the ends of the pass, which is more viscous than the glass at the center of the pass, may have a less distance to travel.

I also may, if desired, give the upper face of the receiver at points remote from the pass, a convex form, so as to facilitate lateral flow of glass on ,the receiver to increase the glass bead adjacent to the ends of the pass, whereby the width thereof, after which thethe flow through 'the ends of the pass will be prolonged .to the scope of obtaining square trailing ends on the sheets. Referring to'the accompanying drawing in which corresponding parts aredesignated by corresponding marks of reference,

Figure l is a longitudinal vertical section through a formingmachine embodying my invention.

F igure' 2 is a side elevation thereof.

FiguresB, 4 and 5 are detailed sectional views on the line A-B showing different shapes that may be given thedam, and

Figures 6, f7 and 8 are similar views in vertical section on the line GD showing the different contours'that may be given the glass supporting surface of the receiver.

The forming machine, shown in the drawing, includesthe usual rolls 1 and 2, having rming pass 3 between them,'located opposite the lower end' of an inclined glass receiver 4, .and cheek pieces 5, the distance between the latter determining the length of the forming pass. and the width of the sheet. The cheeks may be tied together by trans verse bars 6.

'In carrying out my invention I preferably make the upper sur 'ace of the glass receiver near the higher end thereof convex in transverse section. This may be done by curving it as shown in Fig. 7, or by formin it with ,two lane faces meeting at an ang ein the mid e line of the receiver, as shown in Fig. 8. If this is done the surfaces are so warped that such upper face is substantially'flat at its .lower end adjacent to the forming pass, with which it is arallel. If desired the whole surface of t e receiver may be plane in transverse section, as is shown in Fi 6. In carrying out my invention I rcfirably construct the dam in the form 0 a shutter 9 mounted for movement towards and from the receiver immediately in advance ofthe forming pass, the shutter fittingbetween' the cheek pieces 5, The shutter may be'either. I v

flat in sectionfrom side to side, as-='shown in Fig. 3, or convex away from the pass; eitherff" with a continuous curve as shown in Fig. i, or with intersecting faces, as shown in Fig. 5.

The shutter may for convenience be mounted by bolts 10 on each side at itstop on arms- .100 I piece 5 to hold the shutter up.

In the use of a forming machine constructed in accordance with this invention, the 'shutter is lowered as shown in Fig. 1, before the glass is poured on the receiver from a pot or adle 16. As shown in Fig. 1, the first pouring of the glass 17 is immediately adjacent to the shutter and when the glass so oured has spread the full width of the ta le the shutter is raised until the latches 13 engage thep'ins 14 and hold the shutter in its elevated position. The lifting of the shutter releases. the glass, which was dammed up by it to How. to the pass. As the crest of-the dammed up glass is close to the forming pass and preferably immediately adjacent to the line where the surface of the forward upper quadrant of the lower roll 2 starts its drag on the glass, the arrival of the glass is practically simultaneous throughout the length of the pass, thus avoiding the formation of a rounded leadin end on the sheet when formed. As the g ass at the sides of the receiver is generally more viscous, there may be under some circumstances, even when the 7 Shutter is used, a lag in the arrival of the glass at the ends of the pass, and this may e corrected by using a convex face on the shutter as shown in Figs. 4 and 5, whereby the crest of the dammed up glass is given a crescent shape, with the ends of the crest closer totthe pass than is its center, to compensate for the greater viscosity at the ends.

The pouring continues, as the glass thus initially poured flows to the pass, and as shown in Fig. 2, the final pouring due to the tilting of the ladle is on the higher end of the receiver; Ifthe surface of that portion is convex as shown in Figs. 7 and 8, the glass tends to feed not only directly towards the pass, but towards the sides of the receiver,

, and hence towards the ends of the pass. This increases the head serving to feed such ends, and to thus prevent the formation of a rounded trailing end on the sheet.

When the glass on the receiver has fed to the pass, the latches 13 may be disengaged, allowing the shutter to again drop, when the operation may be repeated. I

Having thus described 'myinvention,

what'I claim ,is:

' 1. In a glass forming machine the combination with a pair of rolls, with a sheet forming pass between them, ofan inclined glass receiver adjacent to the'forming pass and feeding glass thereto, and a' removable dam above the receiver and located in advance of the pass and adjacent thereto, th lower edge of the dam being convex.

2. In a glass forming machine the combi nation with a pair of rolls, with a sheet form ing pass between them, of an inclined glas. receiver adjacent to the forming pass anl feeding glass thereto, and a removable dan above the receiver and located in advanc of the pass and adjacent thereto, the upper surface of the receiver at a plane remot from the forming pass being convex trans versely, and being plane adjacent to the pass 3. .In a glass forming machine the combi nation with a pair of rolls, with a sheet form ing pass between them, of an inclined glas receiver adjacent to the forming pass anc feeding glass thereto, the upper surface 01 the receiver at a point remote rom the forming pass being convex transversely, and a removable dam above the receiver and located in advance of the pass and adjaceni thereto. i

4. In a glass formin machine the combination with a pair 0% rolls, with a sheet forming pass between them, of an inclined glass receiver adjacent to the forming ass and feeding glass thereto, the upper sur ace of the receiver at a point remote from the forming pass being convex transversely. and a removable dam above the receiver and located in advance of the pass and adjacent thereto, the face of the dam away from the pass being convex. t

5. In a lass forming machine the combination wit a pair of rolls having'an inclined sheet forming pass between them, of a. glass receiving surface adjacent to the forming pass and feeding glass thereto, the upper surface of the receiver at a plane remote from the forming pass being .convex transversely, while adjacent to the forming pass the receiving surface has a plane surface.

6. The hereinbefore described method of feeding glass to the forming pass of an intermittent sheet glass forming machine, which comprises pouring glass on an inclined receiver, damming the flow of glass from the receiverto the pass until the glass has spread across the receiver, and then removing the dam.

7. The hereinbefore described method of feeding glass to the forming pass of an intermittent sheet glassforming machine, which comprises pouring glass on an inclined receiver, creating a concave front wall removable dam above the receiver and loated in advance of the ass and adjacent hereto, with means for owerin%1the dam n the receiver in order to check t e flow of glass poured on the receiver until the glass ontacts with the dam through the width hereof and for raising'the dam out of conact with the glass to permit the glass to flow freely to the forming pass, the face of the lam away from the forming pass con- 'ex to permit the glass-to spread more quicky to t e lateral ends of. the dam while low- :red on the receiver.

LUCIEN DELLOYE. f 

